Getting Started

Signalboost is taking a break in order to get better.

The Signalboost service is currently down for some much needed infrastructure improvements. We've been deeply inspired by the demand for this tool and hearing about the amazing things our community has been able to accomplish with it.

In order to better serve you and prioritize the wellbeing of our team, we've decided to pause operations until we can offer a stable and reliable service. We anticipate this downtime will extend for the rest of the month, and we'll post updates as we know more. Thanks for bearing with us! You can reach us at with any questions.

Signalboost Guide

Disappearing Messages

By default, messages on Signalboost channels disappear after 1 week. However, admins and admins only can override the 1-week duration using the disappearing message timer in the top right hand corner of the Signal app. We recommend shortening the duration of disappearing message timer (usually to 1 day or 6 hours) if your broadcasts will contain sensitive information.

Language support

Signalboost currently supports English, Spanish, French, and German. To switch to your language of choice, type the name of the language into the channel. For example, if I want to switch my language to Spanish, I would send "ESPAÑOL" to the channel.


How do I get people to join my channel?

Here's a short video of how to get people to subscribe to updates from your channel. They can send HELLO to your channel phone number or you can invite them.

How do I broadcast a message?

If you're an admin, use the BROADCAST command or the ! shortcut to broadcast a message to all the members of a channel:

BROADCAST Hello everyone! Community Meeting at 6pm this evening.
! Hello everyone! Community Meeting at 6pm this evening.

Here's a short video of what that looks like.

How do I respond to a hotline message?

Incoming hotline messages are followed by an @id:

[HOTLINE @3214]
Hello! We need a legal representative at jail support location XYZ.

In order to respond privately to that person, type @ followed by the id:

@3214 Okay, we are sending someone over!

And the subscriber you replied to will receive the following message:

Okay, we are sending someone over!

How can I see a list of commands I can use?

HELP lists the possible commands you can use.

How can I see how many people are subscribed to my channel?

INFO shows stats and briefly explains how Signalboost works.

How do I add or remove an admin on my channel?

Add an admin with phone number +1-555-555-5555:

ADD +1-555-555-5555

Remove an admin with phone number +1-555-555-5555:

REMOVE +1-555-555-5555

Other useful commands

PRIVATE good morning fellow admins!

Sends a private message to admins only (subscribers will not be able to see those messages).

For a shortcut, use the "~" symbol instead:

~ good morning fellow admins!


Switches language to Spanish, French, or German. Language changes on Signalboost are user-specific, so if you change your language to Spanish other admins and subscribers' channels will be unaffected.


Bans an abusive subscriber on your channel. Banned subscribers will be prevented from any further interaction with the channel and cannot be un-banned.

BAN @123


Leaves the channel. If you're an admin, you will lose your admin access to the channel but will still be able to subscribe as a subscriber. If you want to obtain admin access again, you will need to ask a current admin to add you using the ADD command.


Danger zone! This command permanently destroys the channel and all associated records. Importantly, it does not erase the message history from admin and subscribers phones until the duration of the disappearing message timer is up.

Managing your channel


VOUCHING ON: turning vouching on means that an invite (1 by default) is required to join the channel. Both admins and subscribers can invite people to the channel using the INVITE command.

VOUCHING OFF: this is the default behavior of the channel; anyone can join by sending HELLO to the channel number.

VOUCHING ADMIN: this means that an invite from an *admin* is required to join the channel. If other people try to send invites, they will be prevented from doing so.

INVITE +1-555-555-5555

Invites +1-555-555-5555 to subscribe to the channel. Remember to preface the phone number with a + and country code!

Multiple invites can be sent by listing phone numbers separated by commas:

INVITE +1-555-555-5555, +1-333-333-3333


This changes the number of invites needed to join the channel. For example:


After executing this command, anyone who wants to join the channel will need 3 invites.

Managing a hotline


Enables or disables a hotline, which allows admins to receive anonymous messages from subscribers. Channel hotlines are off by default. If you're an admin, you'll know that a message coming in is a hotline message because it will have the following header:

[HOTLINE #3214]

If you decide to turn the hotline on:

  • Your subscribers' anonymity will be preserved when they message the hotline.
  • Depending on the number of people subscribed to your channel, the hotline can be noisy and increase the chances of spam/abuse.